CPT® Code 72159

Magnetic resonance angiography (MRA) is a specialized imaging technique that focuses on the spinal canal and its contents, utilizing either contrast material or performing the procedure without it. This noninvasive diagnostic radiology procedure employs a powerful magnetic field combined with radiofrequency energy to generate detailed images of blood vessels. The primary purpose of conducting an MRA of the spinal canal is to evaluate potential vascular abnormalities or lesions affecting the spinal cord. Such conditions may include dural arteriovenous fistulas, which are abnormal connections between arteries and veins, and intramedullary glomus type arteriovenous malformations, which are complex vascular structures within the spinal cord. During the procedure, multiple images are captured, typically with a thickness of 1-2mm, and these images are subsequently processed to create maximum intensity projections (MIPs). MIPs are akin to subtraction angiograms, allowing for enhanced visualization of the vascular structures. The radiologist identifies specific areas of interest within the images, which are then coned down to produce more detailed views of the blood vessels. This image post-processing is carried out by a technologist, while the radiologist reviews both the MIPs and the initial MRA images to compile a comprehensive written report of the findings. In certain cases, an intravenous line may be established to administer contrast dye, which aids in improving the clarity and detail of the images obtained during the procedure.